Sandi Pierantozzi, a Philly potter, sells a complete set of templates for building all kinds of forms. She was selling them at NCECA and they were reasonably priced. Check it out ... http://sandiandneil.com/

at a coffee-to-go stand or any of Starbucks cafe get yourself espresso in a paper cup, then after drinking it open it carefully to flatten it and there you have a perfect template. this is what i did. adi